National Survey Investigating Hallucinogenic Trends
National Survey Investigating Hallucinogenic Trends
The leading, most comprehensive survey of adults actively using psychedelic substances in the United States. NSIHT study will improve overall safety, utility, and effectiveness using real-world evidence.
Use of Psychedelic Substances in the United States, 2024
Latest Data Report (2024)
The Five Key Findings:
- Psychedelic substance use was highest among younger adults.
- Psilocybin was the most used psychedelic
- Use varied by geographic region
- Psychedelics were perceived to improve mental health
- Most common settings of use included use with friends or family and in small private settings

About NSIHT
NSIHT is the largest ongoing survey of adults using psychedelics in the U.S., providing critical data to improve safety and effectiveness. NSIHT has launched three times since 2024, expecting it’s fourth data collection period in Winter 2025. NISHT is designed to study the context surrounding how adults use these substances, including detailed measurements of behaviors related to the use of specific substances. The survey also monitors changes in psychedelic use over time.

What We Track
![]() | 17 psychedelic substances including both pharmaceutical and recreational forms including classic psychedelic, empathogenic, and dissociative substances |
![]() | Behaviors surrounding use |
![]() | Outcomes of use |
![]() | Characteristics of the people who use psychedelics |
Who Uses Our Data
Researchers • Government Agencies • Clinicians • Policymakers
Survey Methods
Design: Repeat cross-sectional online survey, conducted twice yearly
Participants: U.S. adults (18+) who used psychedelics in the past year
Coverage: Nationally representative across all states
Quality: Validated methodology with 2+ years of development
Funding: Development of pilot funded through US Substance Abuse and Mental Health Administration (SAMHSA) Grant No. 75S20124P00003
Work With Us
Our data supports evidence-based decisions in policy, clinical practice, and research. We can provide technical reports with data insights, limited datasets, or expert consultation.
Contact: info@rmpds.org
To learn more or for collaboration opportunities & additional survey capabilities, please contact us
FAQ
How often is new data collected? Twice yearly, with annual comprehensive reports.
Is participation confidential? Yes, completely anonymous and confidential.
How is the data nationally representative? Through strategic oversampling and statistical transport weighting and data fusion techniques.
Where can I learn more about the survey methodologies? NSIHT is registered on Open Science Framework.
Learn More:
Current Bibliography Including NSIHT Data
Several NSIHT publications are anticipated to be published in 2025. Currently published and available publications are listed below:
- Rocky Mountain Poison & Drug Safety. (2025) Use of Psychedelic Substances in the United States, 2024: Results from the National Survey Investigating Hallucinogenic Trends (NSIHT) (RMPDS Publication No. RMPDS-2025-I-01). Rocky Mountain Poison & Drug Safety, Denver Health and Hospital Authority. Denver, CO. https://www.rmpds.org/nsiht
- Rockhill K, Bemis EA, Schow N, Beekman K, Olsen HA, Fox EJ, Monte AA, Black CB. Establishment of External Validity of the National Survey Investigating Hallucinogenic Trends (NSIHT). Open Science Framework Protocol. doi:10.17605/OSF.IO/856DX. Retrieved from: https://osf.io/856dx
- Rockhill K, Bemis EA, Schow N, Beekman K, Olsen HA, Fox EJ, Monte AA, Black CB. Establishment of Internal Validity of the National Survey Investigating Hallucinogenic Trends (NSIHT). Open Science Framework Protocol. doi:10.17605/OSF.IO/A65XV. Retrieved from: https://osf.io/a65xv
- Black JC, Rockhill KM, Fox EJ, Jewell JS, Dart RC, Monte AA. Psychedelic Trips: Travel Within the United States to Use Psychedelic Drugs After Legalization. Ann Emerg Med. 2025 Jun 30:S0196-0644(25)00308-7. doi: 10.1016/j.annemergmed. 2025.05.016. Epub ahead of print. Psychedelic Trips: Travel Within the United States to Use Psychedelic Drugs After Legalization - ScienceDirect

NSIHT Psychedelic Survey Research
National population survey monitoring the real-world use of psychedelics to understand prevalence of use, context of use, benefits, and harms.